Sildenafil
PDE5 Inhibitor | Erectile Function & Pulmonary Hypertension
Sildenafil is the first PDE5 inhibitor to reach the market and remains one of the most widely recognized pharmaceuticals in the world. Originally developed by Pfizer scientists investigating treatments for angina and hypertension, sildenafil's pronounced effect on erectile function was discovered during Phase I clinical trials in 1992. It received FDA approval for erectile dysfunction in 1998 under the brand name Viagra, and subsequently gained a second FDA approval in 2005 as Revatio for the treatment of pulmonary arterial hypertension (PAH). Sildenafil is a shorter-acting PDE5 inhibitor with a half-life of 3-5 hours and a therapeutic window of approximately 4-6 hours. Unlike tadalafil, sildenafil absorption is significantly reduced by high-fat meals, and its lower selectivity for PDE5 over PDE6 (the retinal phosphodiesterase) can produce transient visual disturbances such as a blue-tinged color shift at higher doses. Despite the availability of longer-acting alternatives, sildenafil remains a first-line treatment for ED due to its well-established efficacy, extensive safety data spanning over 25 years, and wide generic availability.
Moleküler Gösterim
M.W.: 474.58 Da
PubChem 2D yapı diyagramı
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Referans illüstrasyonu — ürün listesi değildir
Etki Mekanizması
Sildenafil selectively inhibits phosphodiesterase type 5 (PDE5), the enzyme responsible for the hydrolysis and degradation of cyclic guanosine monophosphate (cGMP) in vascular smooth muscle. During sexual arousal, nitric oxide (NO) is released from nerve terminals and endothelial cells in the corpus cavernosum, activating soluble guanylate cyclase and increasing intracellular cGMP concentrations. Elevated cGMP activates protein kinase G (PKG), which phosphorylates multiple targets leading to smooth muscle relaxation, vasodilation of penile arteries, and engorgement of the corpora cavernosa with blood. By inhibiting PDE5, sildenafil prevents cGMP breakdown, prolonging and amplifying this vasodilatory cascade. Sildenafil requires sexual stimulation to be effective, as NO release is the initiating signal. In pulmonary arterial hypertension, the same PDE5 inhibition relaxes pulmonary vascular smooth muscle, reducing pulmonary artery pressure and pulmonary vascular resistance, thereby decreasing right ventricular afterload and improving exercise capacity. Sildenafil also has moderate inhibitory activity against PDE6, the phosphodiesterase isoform in retinal photoreceptors, which underlies the transient visual color changes reported by some users.
Sildenafil is the first PDE5 inhibitor to reach the market and remains one of the most widely recognized pharmaceuticals in the world. Originally developed by Pfizer scientists investigating treatments for angina and hypertension, sildenafil’s pronounced effect on erectile function was discovered during Phase I clinical trials in 1992. It received FDA approval for erectile dysfunction in 1998 under the brand name Viagra, and subsequently gained a second FDA approval in 2005 as Revatio for the treatment of pulmonary arterial hypertension (PAH). Sildenafil is a shorter-acting PDE5 inhibitor with a half-life of 3-5 hours and a therapeutic window of approximately 4-6 hours. Unlike tadalafil, sildenafil absorption is significantly reduced by high-fat meals, and its lower selectivity for PDE5 over PDE6 (the retinal phosphodiesterase) can produce transient visual disturbances such as a blue-tinged color shift at higher doses. Despite the availability of longer-acting alternatives, sildenafil remains a first-line treatment for ED due to its well-established efficacy, extensive safety data spanning over 25 years, and wide generic availability.
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Kaynaklar
- Sildenafil citrate therapy for pulmonary arterial hypertension — Galie N, Ghofrani HA, Torbicki A, Barst RJ, Rubin LJ, Badesch D, Fleming T, Parpia T, Burgess G, Branzi A, Grimminger F, Kurzyna M, Simonneau G
- Oral sildenafil in the treatment of erectile dysfunction — Goldstein I, Lue TF, Padma-Nathan H, Rosen RC, Steers WD, Wicker PA
- Efficacy and safety of sildenafil citrate in the treatment of men with mild to moderate erectile dysfunction — Boolell M, Allen MJ, Ballard SA, Gepi-Attee S, Muirhead GJ, Naylor AM, Osterloh IH, Gingell C
- Hemodynamic effects of sildenafil in men with severe coronary artery disease — Herrmann HC, Chang G, Klugherz BD, Mahoney PD
- Phosphodiesterase type 5 (PDE5) inhibitors in the management of erectile dysfunction: an update — Hatzimouratidis K, Hatzichristou DG